In European countries and countries with a history of colonization by European powers.
Germany and France
The country with the largest Catholic percentage of the population is Vatican City, at 100%.
People moved to the countries in the European Union for the better standard of living, from other countries.
Malta is the smallest and least populous of the European Union countries.
1000
Industrialization led to a burst in population for European countries (primarily Western).
Probably any countries with a Christian or Catholic population
The population of the European Union is roughly half a billion.
All the European countries were still Catholic when Henry VII was on the throne, Germany and England would change faiths during Henry VIII's reign.
Italy and The Philippines
less population